I really need help with these two problems, thanks so much inadvance for your help!
1)The frequency of a siren is 20% more when the firetruck isapproaching you and after passing you as you stand on the sidewalk.The speed of the firetruck is:
a)31 m/s
b)16 m/s
c)8 m/s
d)6m/s
e)3 m/s
2)The physics professor can just be heard in the back row, 10 maway. The loudness of the professor's voice front row is 2m away,will be:
a)100 dB
b)25 dB
c)15 dB
d)10 dB
e)5 dB
